You put this setting into the device profile or into the device settings directly.
As noted in MrWeb’s response the variable for the t48s is yealink_t48s_wallpaper
so the setting is “yealink_t48s_wallpaper” and the value is a reachable URL with the jpg or png.
and if use the setting “yealink_t48s_wallpaper_filename” and set it to the name of the file plus extension, it will be used as wallpaper.
for example: setting name > value
yealink_t48s_wallpaper >
https://www.google.com/blue.jpg
yealink_t48s_wallpaper_filename > blue.jpg
I have noticed when I started out in fusion I would notice that when the phones provisioned it would not set the bkg until a reboot or I provision the phone a second time. I would always see the phone properly downloaded blue.jpg but for some reason just wouldn’t set it until a reboot and reprovision.
lit should go without saying but none of this will work if your phones aren’t provisioning from the fusion server.
Also your templates are located in
/var/www/fusionpbx/resources/templates/provision
I use all custom stuff in mine and put them in etc but I believe mark said in coming updates he was also gonna do this so if they aren’t there u can try /etc/fusionpbx/resources/templates/provision